While commercially managed bee colonies largely feed on managed crops and wildflowers, the backyard beehives rely on flowering trees and local gardens for food.
Local gardens are an especially valuable resource for urban and suburban beehives. Unlike agricultural crops, which feature acres of the same flowers over large geographic areas, local gardens provide bees exactly the opposite: a diverse source of nutrients over a small geographic footprint. Private gardens benefit bees because the vast variety of flowers produces a diverse diet. The variation of flowers also results in an extended flowering period. When one type of plant finishes flowering, typically another takes over.
If you are a gardener, consider yourself an ally of the bees. They love you!
If you would really like to help the bees in your neighborhood, think about planting some of their favorite flowers: